A car rental service has fixed monthly expenses of $⁢4,000 for office rent and $⁢500 for insurance. Its variable expenses are $⁢20 per car rented and $⁢300 for maintenance. What is the correct variable expenses equation V⁡(q) based on the number of cars rented q ?

Variable expenses include the cost that changes with the number of cars rented and the stated $300 maintenance cost. Thus, for q cars, V(q) = 20q + 300. The $4,000 rent and $500 insurance are fixed expenses, so they are not included.

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